Mini player background not showing

The background of the mini player doesn't show up after I embed the widget. If I choose the light background only the background is gone on the site. The title, Soundcloud logo and play button are showing. If I opt for the dark background everything is gone but the play button. In both cases the playback of the song works but there is a display problem.

I have tried previewing the site in Firefox 35.0., Chrome 40.0.2214.111, Internet Explorer 11 and Opera 27. In all browsers the problem is the same. I also updated my flash.